数学季刊 ›› 2007, Vol. 22 ›› Issue (3): 402-405.
摘要: For any given positive integer n≥1,the Euler function φ(n) is defined to be the number of positive integers not exceeding n,which is relatively prime to n.ω(n) is defined to be the number of different prime divisors of n.In order to know the solvability of the function of φ(φ(φ(n)))=2(ω(n)),properties of the number theoretical function φ(φ(n)) is studied in the paper.
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